Generation of nonclassical narrowband photon pairs from a cold rubidium cloud

Cho, Young Wook; Park, Kwang Kyoon; Lee, Jong Chan; Kim, Yoon Ho

doi:10.3938/jkps.63.943

Journal of the Korean Physical Society

2013

DOI: 10.3938/jkps.63.943

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Generation of nonclassical narrowband photon pairs from a cold rubidium cloud

Young Wook Cho

Kwang Kyoon Park

Jong Chan Lee

et al.

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Cited by 7 publications

(1 citation statement)

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“…1. The SFWM photon pairs are generated from an ensemble of cold 87Rb atoms in a cigar-shaped 2D magneto-optical trap (MOT) [38][39][40]. When the counter-propagating pump (ω p ) and coupling (ω c ) lasers are applied to the cold atom cloud, the Stokes (ω s ) and anti-Stokes (ω as ) photons are generated via SFWM.…”

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confidence: 99%

Einstein-Podolsky-Rosen Entanglement of Narrow-Band Photons from Cold Atoms

et al. 2016

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Einstein-Podolsky-Rosen (EPR) entanglement introduced in 1935 deals with two particles that are entangled in their positions and momenta. Here we report the first experimental demonstration of EPR position-momentum entanglement of narrowband photon pairs generated from cold atoms. By using two-photon quantum ghost imaging and ghost interference, we demonstrate explicitly that the narrowband photon pairs violate the separability criterion, confirming EPR entanglement. We further demonstrate continuous variable EPR steering for positions and momenta of the two photons. Our new source of EPR-entangled narrowband photons is expected to play an essential role in spatially-multiplexed quantum information processing, such as, storage of quantum correlated images, quantum interface involving hyper-entangled photons, etc.Entanglement, initially explored experimentally with the polarization states of a pair of photons [1, 2], has now been demonstrated in a variety of physical systems, e.g., two spontaneous parametric down-conversion (SPDC) photons [3, 4], two-mode squeezed states of optical fields [5, 6], trapped ions [7, 8], neutral atoms [9, 10], and artificial quantum systems [11, 12]. The gedankenexperiment proposed by Einstein-Podolsky-Rosen (EPR) in 1935, on the other hand, involves a pair of particles that are entangled in their positions and momenta [13][14][15]. In addition to fundamental interests, EPR entanglement is essential in quantum imaging and quantum metrology [16][17][18][19]. Here we report EPR position-momentum entanglement of narrowband (∼ MHz) photon pairs generated from χ (3) spontaneous four-wave mixing (SFWM) in a cold atomic ensemble. By using two-photon quantum ghost imaging and interference [20,21], we demonstrate explicitly that the narrowband photon pairs violate the separability criterion, confirming EPR positionmomentum entanglement. We further demonstrate continuous variable EPR steering for positions and momenta of the two photons [22][23][24][25][26][27][28]. To the best of our knowledge, this is the first experimental demonstration of EPR entanglement and EPR steering of position-momentum degrees of freedom of narrowband photon pairs, well suited for spatially-multiplexed quantum information processing, storage of quantum images, quantum interface involving hyper-entangled photons, etc [29][30][31][32][33][34].The position-momentum-like continuous variable feature of EPR entanglement has been explored initially by using quadrature-phase amplitudes of two-mode squeezed states [5, 6]. Genuine EPR position-momentum entanglement of photon pairs became available later by the SPDC process in a bulk crystal [14,15] and is thought to be essential in quantum imaging and quantum metrology [16][17][18][19]. The EPR-entangled SPDC photons, however, are inherently broadband, typically on the order of several THz in bandwidth. This large bandwidth makes the source unsuitable for interfacing with quantum memory based on atom-photon coherent interaction, which typically has the working bandwidth of a ...

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Einstein-Podolsky-Rosen Entanglement of Narrow-Band Photons from Cold Atoms

et al. 2016

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Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

Chen,

Peters,

Hsieh

et al. 2024

Adv Quantum Tech

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This review article focuses on biphoton sources based on the double‐ spontaneous four‐wave mixing (SFWM) process in laser‐cooled as well as room‐temperature or hot atomic ensembles. These biphoton sources have the advantage of providing stable frequencies, ultranarrow linewidths, and a tunability of the temporal biphoton width of more than one order of magnitude for high‐bandwidth applications. Therefore, the generated photons can be efficiently interfaced to, e.g., atomic quantum memories. In contrast, solid‐state biphoton sources typically require assistance by an optical cavity to operate at narrow linewidth that limits the tunability of the temporal width of the biphotons. Present state‐of‐the‐art double‐ SFWM biphoton sources can achieve one of the following results: a spectral linewidth of 50 kHz (290 kHz) or a temporal width of 13 (580 ns) with cold (hot) atoms, a detection rate of about 7 cps, and a generation rate of cps at a duty cycle of 0.4% or of cps in the steady state. The theoretical background of these biphoton sources, experimental implementations with cold and hot atoms, and progress over the years, will be illustrated.

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Narrowband polarization entangled paired photons with controllable temporal length

Yan

Chen

2015

Sci. China Phys. Mech. Astron.

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Generation of nonclassical narrowband photon pairs from a cold rubidium cloud

Cited by 7 publications

References 40 publications

Einstein-Podolsky-Rosen Entanglement of Narrow-Band Photons from Cold Atoms

Einstein-Podolsky-Rosen Entanglement of Narrow-Band Photons from Cold Atoms

Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

Narrowband polarization entangled paired photons with controllable temporal length

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